Linux Bash Command - Displaying Processor Speed - Specific Lines

I am looking for the command to not only show the processor speed but display specific lines. These lines must contain "MHz" or "HZ". Would greatly appreciate the help.

Best How To :

You can do this using a regex.

grep -P 'M?Hz' /proc/cpuinfo

(I assume you made a a typo and meant Hz instead of HZ.)

grep is a tool that reads from the input channel (or file if specified) and returns all lines that match a specific regex (regular expression).

In this case the regex is M?Hz which means, all lines containing (M)Hz.

Note you can drop the M? since it is optional: any line matching MHz will also match Hz...

Furthermore it depends what information you need: /proc/cpuinfo is probably the most extended list of CPU info. As @JonathanReinhart shows, lscpu is also a good candidate for more compact info.

In case the input is generated by a command, you can use a pipe (|):

command | grep 'Hz'

for instance:

lscpu | grep 'Hz'

A pipe means you use the output of the first command as input for the second command (here grep). By using a cascade of pipes, one can thus extract useful information, modify it, etc. You can compare this with an assembly line where the first program (worker) puts something on the assembly line, that is received and further processed by the second worker/program until it reaches the end of the line.

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